Compound, composite, solid electrolyte including the same, and all-solid-state battery

A compound comprising repeating units represented by Formula 1 below, or a compound being a lithium salt thereof:

• wherein in Formula 1 above:
• the X, Y, and Z are each independently one or more selected from the group consisting of Formulas a-1, b, and c-1 below,
• the n is an integer of 1 to 100,
• the q is an integer of 1 to 100,
• the o is an integer of 0 to 100, and
• the * is a connection site between the repeating units, or an end site, and
• wherein in Formulas a-1, b, and c-1 above:
• the R1, R2, and R3 are each independently a hydrogen element, a halogen element, —CN, —NO2, a substituted or unsubstituted C1-C10 alkyl group, a substituted or unsubstituted C1-C10 alkoxy group, a substituted or unsubstituted C2-C10 alkenyl group, a substituted or unsubstituted C2-Cia alkynyl group, —C(═O)R5, —P(═O)(OR5)2, —P(OR5)(OR6), —OP(═O)(OR5)(OR6), —S(═O)R5, or —S(═O)2R5,
• the R4 is a hydrogen element, or a substituted or unsubstituted C1-C10 alkyl group,
• the R5 and R6 are each independently a hydrogen element, a substituted or unsubstituted C1-C10 alkyl group, or a substituted or unsubstituted C2-C10 alkenyl group,
• the L1, L2, and L3 are each independently a direct linkage, or a substituted or unsubstituted C1-C10 alkylene group,
• the X1 and X2 are each independently a hydrogen element, a halogen element, —CN, —NO2, a substituted or unsubstituted C1-C10 alkyl group, or a substituted or unsubstituted C6-C12 aryl group,
• the m is an integer of 1 to 40, and
• the p is an integer of 1 to 200.